I recently started looking into installing a glass shower door for my stall shower. The shower is a one-piece fiberglass pre-fab shower. I assume I need a stud on at least one side of the door to screw the frame into. (through the shower, into the wall, into a stud.) My problem is that I checked both walls and found out that the studs aren't lined up on both sides.
Luckily, the side I would put the hinge on lines up with the edge of the shower. It makes sense to me that the majority of the force/moment is going to be on the hinge side of the frame. However, I'm worried about what might happen if the shower door is slammed shut, applying a large impulse to the side of the frame not anchored into a stud.
So am I screwed because my builder didn't have enough foresight to line up the studs on both sides of the shower, or is one side good enough?
EDIT: What type of anchors should I use, if I decide to put in the shower door with only a stud on the hinge side? Should I drill out the fiberglass and stick an anchor just in the drywall behind it? Do anchors exist that will span the 1.5" gap between the fiberglass shower and the drywall?